package com.heima.gateway.filter;

import com.heima.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class AuthFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange , GatewayFilterChain chain) {

//        获取了request和response对象
        ServerHttpRequest request = exchange.getRequest ();
        ServerHttpResponse response = exchange.getResponse ();

//        url是否包含 /login
        String path = request.getURI ().getPath ();

        if (path.contains ("/login")) {
            //        特殊情况：当前的操作是登录时执行放行
            return chain.filter (exchange);
        }
//        1、判断是否有token，如果没有token返回一个401
//        从请求头中获取token
        String token = request.getHeaders ().getFirst ("token");
        if (StringUtils.isBlank (token)) {
//            如果没有token返回一个401
            response.setStatusCode (HttpStatus.UNAUTHORIZED);
            return response.setComplete ();
        }

//        2、判断token是否合法 （1.token是否为伪造的  2.这个token是否过期）

        try {
            Claims claims = AppJwtUtil.getClaimsBody (token);

            int type = AppJwtUtil.verifyToken (claims);//Claims claims  -1：有效，0：有效，1：过期，2：过期
//        如果type是-1或0代表token有效
            if (type == -1 || type == 0) {
                //        3、解析token中的userId和name，放到请求头中，继续访问微服务
                Integer userId = claims.get ("userId" , Integer.class);
                String name = claims.get ("name" , String.class);
                //            放到请求头中
                request.mutate ().header ("userId" , userId.toString ());
                request.mutate ().header ("name" , name);

                return chain.filter (exchange);
            }
        } catch (Exception e) {

        }
        response.setStatusCode (HttpStatus.UNAUTHORIZED);
        return response.setComplete ();
    }

    @Override
    public int getOrder() {
        return 0;  //越小越先执行
    }
}